Gate-defined graphene double quantum dot and excited state spectroscopy

Abstract

A double quantum dot is formed in a graphene nanoribbon device using three top gates. These gates independently change the number of electrons on each dot and tune the inter-dot coupling. Transport through excited states is observed in the weakly coupled double dot regime. We extract from the measurements all relevant capacitances of the double dot system, as well as the quantized level spacing.

References in corpus (12)

• Electric Field Effect in Atomically Thin Carbon Films
• Making graphene visible
• Gate-induced insulating state in bilayer graphene devices
• Spin qubits in graphene quantum dots
• Energy gaps in etched graphene nanoribbons
• Tunable Coulomb blockade in nanostructured graphene
• Quantum dot behavior in graphene nanoconstrictions
• Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes
• Hyperfine interaction and electron-spin decoherence in graphene and carbon nanotube quantum dots
• Transport through graphene double dots
• Excited state spectroscopy in carbon nanotube double quantum dots
• Defining and controlling double quantum dots in single-walled carbon nanotubes

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